Blindsign

Definition:n., An expressive gesture made with the belief that the person it is directed at cannot see it, typically occurs during telephone conversations, email discourses, and behind people's backs. v. To use an unseen gesture to express what you cannot say.

Pronunciation: bl-eye-nd-s-eye-nd

Sentence: The two siblings could say one thing while they used blindsign to say another,
taking double speak to a whole new level.